THE SUN HEATS COMETS TO CAUSE OUTGASSING,
REFLECTION OF DUST, MOVING THE COMA BACK
TO FORM A TAIL. COMETS ARE SNOWY DIRTBALLS
OR DIRTY SNOWBALLS - WHICH ONE??

ALSO: The appearance of the nucleus is very dark and sometimes mottled or spotted in appearance because
some of the material from a comet's jets settles back down and clings to the surface. They hold important clues to the formation
of the solar system and could potentially offer natural resources for us if we ever live in space. A comet that takes 200 years or
more to pass around the Sun is a long period comet while short period comets
come more often, every 20 years or less. Comets with orbit periods in between are called
Halley-type comets. Want to know more?